Group24 is about 75 AH give or take a few
Group 27 is the low side of 100
Group 29 is the high side of 100
Group 31 is about 130
You may safely use about 1/4 of a MARINE/deep cycle type battery
GC-2.. I a six volt golf car battery that is about the same size as a Group 24 but a bit taller.. If you have the room then-{6v}+-{6V}+==12 volts at 220 amp hours (Give or take) and you can safely use about half.
LiFePO4.. Not sure how many amp hours they can put in a 24 size (Guessing abourt 100) and of those 100 you can use 90-95 Man need a different converter however.